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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3cdc46582d0c25174a786984a9422395b94fa023d430384fb5b24de5ca67535' 
  AND token = 'PrjMyXpTuuMB1mO6zIrEi2w3a9MMuzvkznN+iTjncI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}